since our instance of HipChat Server is behind the firewall, it's not a trivial task to get IT Security approval to change the FW rules, would this work as a 'workround' upgrade:
I'd be really grateful if you could review these steps and let me know if it looks ok, or if not, what could be missing there.
Yes, those steps look correct. Have you considered the offline upgrade? https://confluence.atlassian.com/hipchatkb/how-to-perform-offline-upgrades-in-hipchat-server-826878852.html
The reason I ask is that the export archive only contains messages, users/user data, and rooms/room data and specifically excludes integrations, passwords, API tokens, and server settings (as dictated at Exporting and Importing your HipChat data).
Running the offline upgrade is an easier solution (be sure to snap-shot your instance before upgrading!) than standing up a fresh install.
HipChat Server Support Engineer | Atlassian
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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